One of who finds enormous satisfaction in excreting the contents of their bowels into their under-garments. Typically, this is done in the vicinity of the public. Each volume of personal waste often has the soiler assume a feigned apologetic air.
"Oh for God sake, busy-bowels is at it again. Filthy little soiler" - Soiliceli: A Mother's Horror Story.
"With each expulsion, the soiler's face twisted and contorted as he endured the enormous muscular strain. Following the final copious release, his undergarments were found to be fully saturated with his organic waste. Traditionally, the final rectal stentorian roar is the most significant - marking the end of another instance of this archaic and obscure tradition." - David Suzuki, The Nature of Stool